On Feb 16, 1:43 am, Manuel Kauers wrote:
> 7. Nullspace for matrices over finite fields is unreasonably slow
>
> sage: M = MatrixSpace(GF(2^31-1), 1000, 1001).random_element();
> sage: %time M.right_kernel();
> CPU times: user 165.71 s, sys: 0.01 s, total: 165.73 s
> Wall time: 166.20 s
>
> Math
On Feb 20, 2:52 pm, Burcin Erocal wrote:
> > On Feb 8, 10:38 pm, ObsessiveMathsFreak
> > wrote:
> > > I have a certain integration result which Sage is currently unaware
> > > of. I need a way to make sage aware of it in some fashion, via
> > > substitution or anything else.
>
> > > For example
> On Feb 8, 10:38 pm, ObsessiveMathsFreak
> wrote:
> > I have a certain integration result which Sage is currently unaware
> > of. I need a way to make sage aware of it in some fashion, via
> > substitution or anything else.
> >
> > For example, sage currently cannot perform the following integral
On Feb 18, 5:24 pm, Mark Rahner wrote:
> converts 1/sqrt(5) to 1/5*sqrt(5) so I suspect that this issue can be
> traced to the GiNaC canonical form.
Yes, it does so for a very good reason: By simplifying expressions
this way, you're sure to recognize equal expressions. Compare 2/
sqrt(6) and sqrt
On 02/20/12 11:35, Burcin Erocal wrote:
>
>
> Or you can do this:
>
> sage: t = -2/3*x + 4/3
> sage: t._convert(RR)
> -0.667*x + 1.33
>
Where were you a few weeks ago? =)
Would anyone be opposed to making this a visible method?
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Sorry Jason,
it seems that I missed to define my Normal distribution.
Here is the complete second example:
NV01 = RealDistribution('gaussian',1)
signi = 0.1
lu = NV01.cum_distribution_function_inv(signi/2)
lo = NV01.distribution_function(lu)
ru = NV01.cum_distribution_function_inv(1-(signi/2))
ro
On Feb 19, 6:38 am, ObsessiveMathsFreak
wrote:
> Basically, I want to restrict the variables of a multivariate
> polynomial to a certain set of symbols.
>
> B.variables() should return
> [x,y]
> instead of
> [a,x,y]
>
> How can this be done.
Maybe I misunderstand you, but this approach works fine
On Mon, Feb 20, 2012 at 10:43 AM, Ken Ribet wrote:
> I'll add here is that sage, when asked to find gcd(Mod(5,6),5), will
> just echo back 5. Of course it then gives the same answer when asked
> to find gcd(Mod(11,6),5). In number theory courses, students are told
> that these quantities don't m
On Feb 18, 8:24 pm, Mark Rahner wrote:
> I appreciate that background info. I hadn't tried invoking maxima
> because I read somewhere that simplify() used maxima. I must've been
> reading outdated material. As you stated, maxima does the correct
> thing. Because Sage can invoke maxima, perha
On Feb 20, 10:39 am, Michael Orlitzky wrote:
> On 02/19/12 19:58, Mike wrote:
>
> > When I run:
>
> > x,y=var('x,y', domain=RR)
> > solve(2.0*x+3.0*y==4.0, y)
>
> > I get
>
> > [y == -2/3*x + 4/3]
>
> > but I would like to get
>
> > [y == -0.666*x + 1.3]
>
> > How can I d
I'll add here is that sage, when asked to find gcd(Mod(5,6),5), will
just echo back 5. Of course it then gives the same answer when asked
to find gcd(Mod(11,6),5). In number theory courses, students are told
that these quantities don't make any sense.
Ken
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On Mon, 20 Feb 2012 10:39:11 -0500
Michael Orlitzky wrote:
> On 02/19/12 19:58, Mike wrote:
> > When I run:
> >
> > x,y=var('x,y', domain=RR)
> > solve(2.0*x+3.0*y==4.0, y)
> >
> > I get
> >
> > [y == -2/3*x + 4/3]
> >
> > but I would like to get
> >
> > [y == -0.666*x + 1.33
On 02/20/12 10:39, Michael Orlitzky wrote:
> For a workaround, someone recently showed me this. You would call
> `symbolic_approx` on your result.
Whoops, you'll need this, too:
from sage.symbolic.expression_conversions import Converter
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On 02/19/12 19:58, Mike wrote:
> When I run:
>
> x,y=var('x,y', domain=RR)
> solve(2.0*x+3.0*y==4.0, y)
>
> I get
>
> [y == -2/3*x + 4/3]
>
> but I would like to get
>
> [y == -0.666*x + 1.3]
>
> How can I do this?
>
Wild guess: the float coefficients are coerced to
On 2/18/12 7:30 PM, Goebbe wrote:
Using sage 4.8 in the notebook environment I have problems to scale
polygons:
For example, the following code generates a graphs that seems to be to
small (not high enough):
polygon2d([[0,0],[0,1],[-1,0]], rgbcolor=(1,0,1),xmin=-4, xmax=4,
ymin=0, ymax=1)
Use
Thanks a lot for your answers.
The figsize option did not work. The problem is that the graph is not
tall enough
(has not enough height). figsize just scales the whole image but keeps
the wrong
aspect ratio.
Resizing the y-axis did not do the trick neither. Look at my first
example,
I already spec
Hi Mark,
I agree with you, and by experience I could say that SAGE could be a
bit frustrating to learn at first... but is worth!
I'm not sure if it'd help you, but notice that there are two different
routines of simplification, say, simplify() and full_simpllify(). Try
using the second one with y
On Feb 20, 2012, at 9:05 AM, ancienthart wrote:
> Guys, is there a method or function to flip an equation or inequality?
>
> I'd like to turn 2*x + 3*y < 8 into 8 > 2*x + 3*y automatically.
>
> Joal Heagney
If you just mean to reverse the order in which it is printed without changing
the mathe
On 20 February 2012 05:01, William Stein wrote:
> On Sun, Feb 19, 2012 at 8:25 PM, D. S. McNeil wrote:
>>> sage seems to think that the gcd of 6 and (-2 mod 6) is -2 mod 6, which it
>>> converts to 4. A mathematician would say that the gcd is 2.
>>> Is this a bug, or does sage have a higher pur
Guys, is there a method or function to flip an equation or inequality?
I'd like to turn 2*x + 3*y < 8 into 8 > 2*x + 3*y automatically.
Joal Heagney
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